Tool grip



Fd l0, 1925.

F. o BERMuLLER TOOL GRIP me@ Feb. 21, 1924 z snms-sneet 1 f v l gmnntO/' I: ber-malle# Patented Feb. 10, 1925.

FRANK GEEK/MULLER, GF S PATENT DFFICE.

TE, GENEVIEVE, MISSOURI.

TOOL GRIP.

Application filed February 2 To all whom 2'?? 'may concern.'

Be it known that l, FRANK Oenmronmin, a citizen of the United States, residing` at Sainte Genevieve, in the county of Sainte Genevieve and State of Missouri, have invented certa-in `new and` useful linprovee ments in Tool Grips; and l do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled inthe art to which it appertains to make and use the saine.

In 'the drilling of oil, artesian and other deep wells it frequently happens that the tools become fast for one reason or another and time is required for loosening and recovering the same, and in many instances after hours have been spent in a vain attempt to recover the tools, the latter and the well become abandoned, thereby resulting in a considerable loss both in tools, ad-

junctive parts and the time expended in the boring of the well to the point of abandonment. l

The present invention has for its object to provide a grip which may be lowered into the well and engage the tools and which is attached to and adapted to be operated independently of the rope or cable attached to the tools for operating them in the first in stance, the auxiliary cable sustaining the load `and pull while the drilling cable may be utilized jointly with 'jars to effect a loosening of the tools, thereby insuring` a recovery of the tools in a comparatively short time.

Other objects and advantages will be apparent and suggest themselves as the nature of the invention is understood.

lhile the. drawings illustrate an embodiment of the invention it is to be understood that in adapting the same to meet different conditions and requirements, various changes in the form, proportion and minor details of construction may be resorted to without departing from the spirit of the invention.

Referring to the accompanying drawings forming a part of the application:

Figure l is a detail view illustrating the application of the invention,

Figure 2 is a perspective view of the grip,

Figure 3 is a sectional view of the grip,

Figure 4 is a detail view of the plate or ring to which the dog is pivoted,

Figure 5 is a detail perspective view of 1 1924:. Serial No, 694,330.

portions of adjacent plates or rings separated showing the opening in one and the projection on the other for closing the opening when the plates are assembled, and

Figure 6 is a detail view. j

Corresponding and like parts are referred t-o in the following description and designated in the several views of the drawings by like reference characters.

The grip constructed in accordance with the invention comprises a plurality of plates or rings which are placed one upon the other and secured by means of bolts or analogous fastening means, each of the plates or rings having' a lateral opening` for the passage of the rope or cable and the adjacent plate or ring having a projection to enter and close the opening whereby the body of the grip is adapted to encircle the drilling cable and the too-l to be recovered, said body be ling provided ywith a dog which` is pivoted" thereto and adapted to securely and positively engage the tool to insure its recovery after beingiloosened.

The body of the grip is of composite structure and comprises a plurality of annu` lar plates or rings, the number being immaterial and depending upon the thickness of the ring and the strength required of the grip to withstand thestrain to which it will be subjected when in active operation. The plates or rings 1 are placed one upon the other and are secured by means of bolts 2 or analogous fastening means. Each of the plates or rings l is provided in a side with an opening 3 for the passage of the rope or cable when placing the grip in position or removing it from the cable attached to the tools. The openings 3 are located at dil'erent relative points so as not to aline when the plates or rings are assembled. The adjacent plate or ring is provided with a projection l in position to enter and till the opening 3 of the contiguous plate or ring and close said opening. Each of the plates or rings l is enlarged at a point in its circumferential length and these enlargements or widened portions aline when the plates or rings are assembled and are formed with an opening through which an eyebolt 5 passes and to which is attached a rope or cable G whereby the grip is operated when in action.

A dog 7 of crescent or semicircular form is disposed within the body of the grip and is pivotally connected intermediate its ends to a ring or plate thereof and is normally supported in horizontal position by an inner shoulder S which forms a stop or rest therefor and which is provided by the plates or rings in'imedi'ately 'below that to which the dog 7 is pivoted. The ring or plate next above that to which the dog 7 is pivoted is cut away opposite the pivot of the dog to provide ample clearance for the latter so that its free end may rise when lowering the grip and the dog-Tengages and rides upon the tool S) to be recoveredfrom the well. The active or biting edge of the dog 7 bevele'dt'o insurea positive grip between the dog and tool so that sufficient force may be exerted to extractv and recover the tool.

lIn practice, when a tool'S) becomes fast in the well and cannot be removed in the ordinary manner and bythe usual means employed, the'grip may be employed and the same is dismembered and each plate or ring iis-separately placed'in position about the 'drilling cable 10, the openings 3 admitting of the placing ofthe plate in position. After all'vthe plates or rings l have been assembled about the cable l0, they are brought together and made secure by means of the 'bolts 2 land the eyebolt 5, the openings?? being closed by the projections The operating rope or cable G is attached to the eyebolt and the grip is lowered into the well and isguidedby the cable l0 to the tool 9 and slips upon the latter and is made fast thereto by means of the dog T when a pullingforce is applied to the rope or cable .6. v'lhezdrillingcable 1G may be operated .in the-usual ,way to effect a looseningfofI the toolfand thismaybe supplemented by pull force upon the cable 6 and the combined action ofthe two 'cables usually results ina recovery ofthe tool which otherwise could not be effected by the operation of the drill cable alone yin the ordinary manner of operation.

What is claimed is:

l. A grip for recovering a tool which has become fast in a deep well, the same com prising a plurality of plates, each plate having an Vopei'iing for the passage of the drilling cable and the adjacent plate having a projection to snugly lit and close the opening, fastening means for securing the plates when assembled, and a dog applied to the body of the grip for positively engaging the tool to be recovered.

,-"i grip for recovering a tool which hasl become fast in a deep well, the same coniprising -a plurality of plates, each plate having an opening for the passage of the drilling cable and the adjacent plate hav-M1 ing a projection to snugly fit and close the openino', fastening means for se uring the plates when assembled. and a dog applied to the body of the gri) for positively engaging the tool to be recovered, certain plates below the dog forming' a stop shoulder therefor and the plate next above the dog being cut away to provide clearance'to allow 'for the pivotal movement of the dog.

3. A. grip of the character speci lied coinprising a plurality of plates placed one upon the other, eachhaving a side opening and the adjacent plate having a projection to tit the opening of the contiguous plate, 'fastening means for securingthe plates when assembled, a dog pi'voted to one of the platea and normally supported in operative positionr by the plate next below that to which the dog is pivoted, and an eyebolt serving as supplementary means to connect the plates andadaptedto receive the operating rop(l or cable,

ln testimony whereof l afiix my signature in presence'of two witnesses.

FRANK OBERMULLER. Viitnesses: n

STEVE ROTH, AUGUST W. BRECKLE. 

